[OE-core] sstate hash equivalence breaks rm_work

[Tom Rini]

Hey all,

As part of the packagegroup-core-base-utils series I noticed that
with rm_work enabled like I usually have, every build was starting over
with rebuilding linux-libc-headers and going down from there.  I
finished bisecting this now and it comes down to:

commit d889acb4f8f06f09cece80fa12661725e6e5f037
Author: Joshua Watt <jpewhacker at gmail.com>
Date:   Fri Jan 4 10:20:15 2019 -0600

    sstate: Implement hash equivalence sstate

This can be reproduced easily with qemux86, core-image-minimal, oe-core
and this in site.conf:
# Save more space
INHERIT += "rm_work"
# But keep this around for debugging
RM_WORK_EXCLUDE += ""
INHERIT += "buildstats"
INHERIT += "buildstats-summary"

(I doubt the last two matter, but I only noticed that was in my bisect
just now).

-- 
Tom
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